Road vehicle braking system

Abstract

A brake system is provided for a towing road vehicle attached to a towed road vehicle. An electric switch in the towing vehicle is electrically connected to one or more electrical pumps in the towed vehicle which are capable of increasing hydraulic pressure in the hydraulic brake system of the towed vehicle.

1 . A braking system for a towed vehicle that is towed by a towing vehicle which comprises: 
 a first gear pump positioned in said towed vehicle, said first gear pump being in first fluid communication between a reservoir for hydraulic fluid in said towed vehicle and a first braking system for a first set of wheels in said towed vehicle, said first fluid communication being free of a valve,    a second gear pump positioned in said towed vehicle said second gear pump being in second fluid communication between a reservoir for hydraulic fluid in said towed vehicle and a second braking system for a second set of wheels in said towed vehicle, said second fluid communication being free of a valve,    and a control connected to a source of electrical power in said towing vehicle, said control including an electrical power control selected from the group consisting of an ammeter and a decelerometer to regulate electrical power to said first gear pump and to said second gear pump in response to braking force applied to said towing vehicle.    
     
     
         2 . A braking system for a towed vehicle that is towed by a towing vehicle which comprises: 
 a first gear pump positioned in said towed vehicle said first gear pump being in first fluid communication between a reservoir for hydraulic fluid in said towed vehicle and a first braking system for a first set of wheels in said towed vehicle, said first fluid communication including a manually operated valve,    a second gear pump positioned in said towed vehicle said second gear pump being in second fluid communication between a reservoir for hydraulic fluid in said towed vehicle and a second braking system for a second set of wheels in said towed vehicle, said second fluid communication including a manually operated valve,    and a control connected to a source of electrical power in said towing vehicle, control including an electrical power control selected from the group consisting of an ammeter and a decelerometer to regulate electrical power to said first gear pump and to said second gear pump in response to braking force applied to said towing vehicle.    
     
     
         3 . A braking system for a towed vehicle that is towed by a towing vehicle which comprises: 
 a gear pump positioned in said towed vehicle, said gear pump being in fluid communication between a reservoir for hydraulic brake fluid in said towed vehicle and a braking system for a set of wheels in said towed vehicle, said fluid communication being free of a valve,    and a control connected to a source of electrical power in said towing vehicle, said control including an electrical power control selected from the group consisting of an ammeter and a decelerometer to regulate electrical power to said gear pump in response to braking force applied to said towing vehicle.    
     
     
         4 . A braking system for a towed vehicle that is towed by a towing vehicle which comprises: 
 a gear pump positioned in said towed vehicle said gear pump being in fluid communication between a reservoir for hydraulic brake fluid in said towed vehicle and a braking system for a set of wheels in said towed vehicle, said fluid communication including a manually operated valve,    and a control connected to a source of electrical power in said towing vehicle, said control including an electrical power control selected from the group consisting of an ammeter and a decelerometer to regulate electrical power to said gear pump in response to braking force applied to said towing vehicle.